current bounds on the number of colors: 0 -- 55 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:37:56 2012 Optimize a model with 21088 rows, 2264 columns and 64584 nonzeros Presolve time: 0.08s Presolved: 21088 rows, 2264 columns, 64584 nonzeros Variable types: 0 continuous, 2264 integer (2264 binary) Root relaxation: objective 0.000000e+00, 125 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (319 simplex iterations) in 0.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 27 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:37:56 2012 Optimize a model with 10182 rows, 1494 columns and 31096 nonzeros Presolve time: 0.03s Presolved: 10182 rows, 1494 columns, 31096 nonzeros Variable types: 0 continuous, 1494 integer (1494 binary) Root relaxation: objective 0.000000e+00, 116 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 36 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (1131 simplex iterations) in 0.13 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 13 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:37:57 2012 Optimize a model with 4729 rows, 1109 columns and 14352 nonzeros Presolve time: 0.01s Presolved: 4729 rows, 1109 columns, 14352 nonzeros Variable types: 0 continuous, 1109 integer (1109 binary) Root relaxation: objective 0.000000e+00, 111 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 90 - 0.00000 - - 0s 0 0 0.00000 0 70 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (2801 simplex iterations) in 0.50 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 6 -- 13 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:37:57 2012 Optimize a model with 7066 rows, 1274 columns and 21528 nonzeros Presolve time: 0.02s Presolved: 7066 rows, 1274 columns, 21528 nonzeros Variable types: 0 continuous, 1274 integer (1274 binary) Root relaxation: objective 0.000000e+00, 125 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 58 - 0.00000 - - 0s 0 0 0.00000 0 65 - 0.00000 - - 0s 0 0 0.00000 0 201 - 0.00000 - - 1s 0 0 0.00000 0 277 - 0.00000 - - 1s 0 0 0.00000 0 228 - 0.00000 - - 3s 0 0 0.00000 0 254 - 0.00000 - - 4s 0 0 0.00000 0 218 - 0.00000 - - 5s 0 0 0.00000 0 217 - 0.00000 - - 7s 0 0 0.00000 0 222 - 0.00000 - - 7s 0 0 0.00000 0 226 - 0.00000 - - 8s 0 0 0.00000 0 226 - 0.00000 - - 8s 0 2 0.00000 0 226 - 0.00000 - - 10s Cutting planes: Clique: 195 Zero half: 5 Explored 33 nodes (51908 simplex iterations) in 11.26 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - current bounds on the number of colors: 9 -- 13 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:38:09 2012 Optimize a model with 8624 rows, 1384 columns and 26312 nonzeros Presolve time: 0.02s Presolved: 8624 rows, 1384 columns, 26312 nonzeros Variable types: 0 continuous, 1384 integer (1384 binary) Root relaxation: objective 0.000000e+00, 125 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 0.00000 0 35 - 0.00000 - - 0s 0 0 0.00000 0 43 - 0.00000 - - 1s 0 0 0.00000 0 225 - 0.00000 - - 1s 0 0 0.00000 0 26 - 0.00000 - - 2s * 0 0 0 0.0000000 0.00000 0.0% - 2s Cutting planes: Clique: 16 Zero half: 14 Explored 0 nodes (13791 simplex iterations) in 2.20 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 9 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:38:11 2012 Optimize a model with 7845 rows, 1329 columns and 23920 nonzeros Presolve time: 0.02s Presolved: 7845 rows, 1329 columns, 23920 nonzeros Variable types: 0 continuous, 1329 integer (1329 binary) Root relaxation: objective 0.000000e+00, 118 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 42 - 0.00000 - - 0s 0 0 0.00000 0 33 - 0.00000 - - 0s 0 0 0.00000 0 158 - 0.00000 - - 1s 0 0 0.00000 0 239 - 0.00000 - - 1s 0 0 0.00000 0 263 - 0.00000 - - 2s 0 0 0.00000 0 262 - 0.00000 - - 3s 0 0 0.00000 0 202 - 0.00000 - - 4s 0 0 0.00000 0 161 - 0.00000 - - 5s 0 0 0.00000 0 261 - 0.00000 - - 6s 0 0 0.00000 0 237 - 0.00000 - - 6s 0 0 0.00000 0 189 - 0.00000 - - 8s 0 0 0.00000 0 226 - 0.00000 - - 9s 0 0 0.00000 0 226 - 0.00000 - - 10s 0 2 0.00000 0 226 - 0.00000 - - 11s 354 18 0.00000 16 121 - 0.00000 - 106 15s 704 20 0.00000 0 228 - 0.00000 - 104 20s 706 21 0.00000 0 133 - 0.00000 - 104 25s 709 23 0.00000 0 191 - 0.00000 - 103 30s 712 25 0.00000 0 141 - 0.00000 - 103 36s 714 27 0.00000 0 141 - 0.00000 - 102 40s 719 30 0.00000 12 200 - 0.00000 - 187 45s 768 27 0.00000 21 156 - 0.00000 - 184 50s 1075 13 0.00000 26 128 - 0.00000 - 173 55s 1397 11 0.00000 20 143 - 0.00000 - 168 60s 1736 10 0.00000 23 133 - 0.00000 - 167 65s 2054 16 0.00000 29 140 - 0.00000 - 165 70s 2335 7 0.00000 23 137 - 0.00000 - 165 75s 2698 8 0.00000 22 124 - 0.00000 - 163 80s Cutting planes: Clique: 12 Zero half: 5 Explored 2991 nodes (535720 simplex iterations) in 84.18 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 11